scholarly journals The effects of the glass surface area/solution volume ratio on glass corrosion: A critical review

10.2172/67461 ◽  
1995 ◽  
Author(s):  
W.L. Ebert
Keyword(s):  
Surface Area ◽  
Critical Review ◽  
Glass Surface ◽  
Volume Ratio ◽  
Glass Corrosion ◽  
Solution Volume

Complex Study of E-Glass Corrosion

2008 ◽  
Vol 39-40 ◽  
pp. 279-286 ◽  
Author(s):  
Pavel Šlemín ◽  
Gerhard Heide ◽  
Aleš Helebrant
Keyword(s):  
Glass Surface ◽  
Volume Ratio ◽  
Solution Flow Rate ◽  
Solution Flow ◽  
Glass Fibres ◽  
Glass Corrosion ◽  
Sample Shape ◽  
Congruent Dissolution ◽  
Different Shapes ◽  
Solution Volume

Both the static and dynamic corrosion tests of E-glass were used for different conditions - temperature, glass surface to solution volume ratio (S/V), solution flow rate (F) and F/S ratio. Results obtained for glass fibres were compared with the ones for glass grains and planar samples. Evaluation of experimental results by kinetic model shows that the change of glass surface should be taken into account in the case of fibres corrosion. The total incongruent process of dissolution could be explained as congruent dissolution of glass accompanied by back precipitation of SiO2 or silicates. In most cases, more then 90% of SiO2 precipitates back. The second possible explanation, i.e. SiO2 network dissolution accompanied by selective leaching of Ca, B and Al, is not very probable. The glass sample shape can influence the estimation of dissolution rate. Up to now, with existing kinetic models, the dissolution rates evaluated from experiments with different shapes of glass (fibres, grains, planar) cannot be used as materials properties.

Glass Surface area to Solution Volume Ratio and its Implications to Accelerated Leach Testing

1982 ◽  
Vol 15 ◽  
Author(s):  
Larry R. Pederson ◽  
Charles Q. Buckwalter ◽  
Gary L. Mcvay ◽  
B. Lynn Riddle
Keyword(s):  
Solid State ◽  
Surface Area ◽  
Glass Surface ◽  
Volume Ratio ◽  
Leaching Tests ◽  
Soluble Glass ◽  
State Diffusion ◽  
Dissolved Silicon ◽  
Glass Leaching ◽  
Solution Volume

ABSTRACTLeaching tests of PNL 76–68 glass in deionized water have been performed using the standard MCC-l static leaching procedure but with varied glass surface area to solution volume ratios (SA/V). It was found that leaching could be strongly influenced by the SA/V ratio, due largely to an effect of silicon solubility limitations. The conclusion that solubility and not solid state diffusion is most important in regulating leaching rates is supported by (1) the similarities in depth profiles of all soluble glass components with none depleted to depths greater than that of silicon despite vastly different solid state diffusivities, and (2) the lack of dependence of leaching rates on reaction layer thicknesses. To more directly examine the influence of dissolved silicon on glass leaching rates, leaching tests were performed in silicic acid solutions and in two actual groundwaters. As expected, leaching rates of all soluble glass components were reduced by amounts roughly proportional to the silicon saturation fraction. Since solubility modifies leaching rates in all but very dilute solutions, short-term tests at high SA/V values can be used to predict solution concentrations for long-term tests at low SA/V values, although reaction layers formed are not of the same thickness. Glass leaching data for a range of leaching times and SA/V values can be represented by a single curve when plotted versus the product of SA/V and time. However, the use of SA/V variations may have limited usefulness in accelerated leach testing for multicomponent systems. Events such as silica colloid and certain alteration phase formations modify the above relationship.

Uranium Sorption on α-Alumina: Effects of pH and Surface-Area/Solution-Volume Ratio

1994 ◽  
Vol 66-67 (s1) ◽  
Author(s):  
James D. Prikryl ◽  
Roberto T. Pabalan ◽  
David R. Turner ◽  
Bret W. Leslie
Keyword(s):  
Surface Area ◽  
Volume Ratio ◽  
Effects Of Ph ◽  
Solution Volume

Borosilicate Glass Corrosion in the Presence of Steel Corrosion Products

1986 ◽  
Vol 84 ◽  
Author(s):  
G. Bart ◽  
H.U. Zwicky ◽  
E.T. Aerne ◽  
TH. Graber ◽  
D. Z'berg ◽  
...  
Keyword(s):  
Surface Area ◽  
Secondary Ion Mass Spectrometry ◽  
Corrosion Behaviour ◽  
Volume Ratio ◽  
Steel Corrosion ◽  
Sample Surface ◽  
Corrosion Products ◽  
High Level Waste ◽  
Glass Corrosion ◽  
High Level

AbstractSince 1982, the corrosion behaviour of radioactive high level waste glass and of inactive glasses of the same composition has been studied in the framework of a Japanese-Swedish-Swiss (JSS) project. In addition to granite and backfilling material, the influence of steel corrosion products on glass corrosion has been investigated in experiments of up to one year at 90°C with a sample surface area to leachant volume ratio of 10 m−1. Leachant and steel corrosion products were separated from each other by filtration and analyzed by atomic absorption spectroscopy and γ-spectroscopy. The glass corrosion layers were characterized by optical and scanning electron microscopy and by secondary ion mass spectrometry.It could be shown, that glass corrosion is enhanced by steel corrosion products. The quantity of corroded glass seems to be dependent on the surface area and not on the total amount of steel corrosion products in the system, suggesting a mechanism controlled by silica sorption on the steel corrosion product. If lead oxide is added to the system, glass corrosion is almost to- tally suppressed.

R7T7 Nuclear Waste Glass Behavior in Moist Clay: Role of the Clay Mass/Glass Surface Area Ratio

1989 ◽  
Vol 176 ◽  
Author(s):  
N. Godon ◽  
E. Vernaz
Keyword(s):  
Corrosion Rate ◽  
Surface Area ◽  
Glass Surface ◽  
Retention Factor ◽  
Distilled Water ◽  
Barrier Material ◽  
Surface Area Ratio ◽  
Corrosion Rates ◽  
Glass Corrosion

ABSTRACTR7T7 glass alteration was investigated in the presence of various moist clays. In contact with smectite 4a, selected in France as a potential engineered barrier material, the glass was significantly corroded: after 6 months the glass corrosion rate was practically the same as the initial alteration rate in double-distilled water. Substantially lower alteration was observed in contact with bentonite 6 activated by sodium carbonate.Smectite 4a consumes silicon released by glass corrosion, and thus retards the rise to high silicon concentrations in solution at which the glass corrosion rate diminishes. Glass can therefore in some cases be altered as much in moist clay as in water with high renewal rates. Other experiments with smaller quantities of smectite 4a showed that the phenomenon becomes less important in time: its duration is proportional to the ratio between the clay mass (C) and the glass surface area (SA). Comparing the results of studies at different C/SA ratios indicates that low glass corrosion rates are obtained more slowly at higher C/SA ratios.Tests with 239Pu-doped R7T7 glass also showed that the radionuclide retention factor in the alteration film at the glass surface is only 6, compared with a factor of nearly 50 in double-distilled water.

Effects of Surface Area-to-Solution Volume Ratio on Chemical Durability of Nuclear Waste Glasses

1989 ◽  
Vol 176 ◽  
Author(s):  
X. Feng ◽  
I. L. Pegg ◽  
Y. Guo ◽  
AA. Barkatt ◽  
P. B. Macedo
Keyword(s):  
Surface Area ◽  
Nuclear Waste ◽  
Volume Ratio ◽  
Fixed Time ◽  
Waste Glass ◽  
Corrosion Mechanism ◽  
General Tendency ◽  
Savannah River ◽  
Report Data ◽  
Solution Volume

ABSTRACTWe report data on the relationship between nuclear waste glass durability, as measured by leachate concentrations and leach rates, and the ratio of glass surface area to solution volume, S/V. The study includes West Valley non-radioactive production glasses (SF6 and SF10), West Valley glasses containing U and Th designed at CUA (WVCM47, WVCM50, and WVCM59), Savannah River SRLTDS-131 glass, and Hanford waste glass HW-39 (for which existing literature data is used). While some of these glasses show departures of leachate concentrations from simple (S/V)t scaling others conform well. The departures are, in all cases, most evident at high values of S/V. It is therefore important, therefore to understand how glass composition determines which corrosion mechanism is dominant in order to assess the region of validity of extrapolations based on (S/V)t scaling. While leach rates show a general tendency to decrease with S/V and time, exceptions are evident for the less durable glasses which show minima and maxima in the S/V-dependence at fixed time.

Colloid Formation During the Interaction of HLW Glass with Interstitial Clay Water

1996 ◽  
Vol 465 ◽  
Author(s):  
J. Wei ◽  
P. Van Iseghem
Keyword(s):  
Size Distribution ◽  
Surface Area ◽  
Glass Surface ◽  
Waste Glass ◽  
Complexation Reaction ◽  
Different Temperatures ◽  
Colloid Formation ◽  
Solution Volume

ABSTRACTDuring the reaction of HLW glass with interstitial clay water at different temperatures with various ratios of glass surface area to solution volume (SA/V) and durations, Eu released from the glass forms predominantly Eu-humate colloids (organic colloids) by a complexation reaction. The size distribution and stability of Eu-humate colloids have been characterized. It is likely that inorganic colloids which are mainly composed of Si, Al and Ca are generated from the corrosion of waste glass by a nucleation reaction.

Uranium Sorption on α-Alumina: Effects of pH and Surface-Area/Solution-Volume Ratio

1994 ◽  
Vol 66-67 (s1) ◽  
Author(s):  
James D. Prikryl ◽  
Roberto T. Pabalan ◽  
David R. Turner ◽  
Bret W. Leslie
Keyword(s):  
Surface Area ◽  
Volume Ratio ◽  
Effects Of Ph ◽  
Solution Volume
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